·A claim that volunteers for lab experiments are really not that different[2] in how they play dictator, ultimatum and trust games from a representative sample of a city’s population..”the convenient sample of self-selected college students that allowed a boom in human experimentation in both social and natural sciences produces qualitatively and quantitatively accurate results” - based on a study in Spain.

·Five common myths on pre-K evidence[4] in Education week – discussion of how a mix of experimental and quasi-experimental evidence give more support for pre-K effects and help overcome the critique that the experimental evidence is just from a couple of very small samples. And if you missed it, see Markus’s discussion this week of evidence for the benefits of daycare[5] in developing countries.